AUSTIN — Sarah Silverman floated a plan for saving labradoodles in Africa, MGMT took fans on a galactic rock journey and the final day of Fun Fun Fun Fest closed Sunday with a teeth-rattling set from thrash-metal legend Slayer.

Partly cloudy skies and cool temps drew large crowds to the venue — four stages spread among a sprawling riverfront park downtown — to catch a variety of acts ranging from trippy rockers The Polyphonic Spree to hip-hop journeymen Jurassic 5.

Drawing some of the day's biggest crowds was comedian/actress Silverman, who performed to packed crowds at the comedy tent. Silverman wasted no time unleashing a raunchy set that included masturbation, Internet porn, pedophilia and saving AIDS victims in Africa.

"We care more about dogs than we do about people," she said to cheers from the crowd. "If Africa was all labradoodles dying of AIDS, we'd save them all in one day."

On the outdoor stages, musical acts shuttled through 50-minute sets. In between, the Taco Cannon belched out bean-and-potato soft tacos to the crowd. Billed as the "only Taco Cannon in existence," the cannon looks like an oversized Gatling gun and shoots out 20 tightly wrapped tacos 20 yards in the air in the span of a few seconds.

At the Orange Stage, fans rocked out to Julie Ruin, the latest incarnation of '90s punk and riot grrrl rocker Kathleen Hanna, former frontwoman of Bikini Kill. Sounding like a meaner, hard-charging Luscious Jackson, Julie Ruin ran through songs like Girls Like Us, to the delight of the crowd. In attendance was Heather Brown, 27, of Austin, who said she grew up listening to Bikini Kill and was thrilled to see Hanna back in action.

Fun Fun Fun Fest's mix of big names and obscure acts make it a unique experience, she said. "To finally be seeing a band you were jamming to in high school is great," Brown said. "The festival's great at bringing all these worlds together."

One of those worlds was created when MGMT took the stage later that evening at the Orange Stage. The New York-based, six-man band launched into their psychedelic rock universe with the hit Time To Pretend. Blending heavy guitar riffs with reverberating keyboards and electronic beats, the group swerved through the mellow sojourn of Congratulations and on to dance favorite Electric Feel, bringing the crowd to a swaying frenzy. On a giant screen behind them, computer-generated birds flapped through space scenes and melting rainbows, seemingly solidifying the group's hold as this generation's Flaming Lips or Pink Floyd.

After MGMT, the metal faithful flocked to see Slayer, while another equally large crowd amassed at the Blue Stage for a rare live performance by Jurassic 5. The group, which has been performing and cutting records since 1994, belted out old-school hip-hop classics such as Jayou and the politically charged Freedom, which the group dedicated to "political prisoners everywhere."

The crowd responded by pumping fists in the air — a fitting ending to a festival that prides itself on rebellious servings.